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OpenStudy (gavnasty2001):
A box of pencils costs $10.The total cost (c) as a function of the number of boxes (b) is expressed as c = f(b) = 10b. What is the domain of this function?
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OpenStudy (idani):
The domain of this function is N, because the number of boxes can only be positive integers (you cannot have 1,3 boxes or -2 boxes). So 10b should be part of N too.
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